The problem is that you can easily read a concise article, nod your head, understand it, and then entirely forget it. With a book, you get the main ideas prese

The problem is that you can easily read a concise article, nod your head, understand it, and then entirely forget it. With a book, you get the main ideas presented multiple times, applied, examined, refined, put in context, etc. Now, you’ll also forget all that apparently extraneous stuff, but at least you’ll remember the main ideas.